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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7268e3ff693d394cd542273bff0f20173b6fc9bb9f3fe8817b13374d77eae0f8' 
  AND token = 'yo7SYCHKhV/O/E+2ctol4uBLeq4z8Nv/owQA498TXro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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