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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90c26d58d957b4535a464aef02a94a12e0ce2915a178c5bcd8ec0ecafc0e893' 
  AND token = 'I7Mq+ofOXzcK9cCr8Td40/JVPyPqCty+njCyty+bZsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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