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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d3329241bc29928973b13a1d44b28cd14b6c57be600c4977c9e49c05ecc1a8' 
  AND token = 'szOMn2LHoMX1S223Rnn+lyT73VFDT62CGz7HAUzU2rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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