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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1959d92c032e6a699c199a12ebb06e8e232c2653bd893dfffd3f9e6c6d76f4e9' 
  AND token = 'sDhVYR24fuQlCnuE4KBsmqScudJ3r8Tly+MYV/ioAXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}