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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6fc45275206066b29acc739aa6c19f194501250c3ceaafe4e3c76318d0c0d4' 
  AND token = 'l0S1lbg3BUP00IjnYB4jYq0u1Ygwp0V/VcKNFwm7O+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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