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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cbd480ba50b8d9a9a7f71b0e7bd0cf119afb16099bd4c110f6569b505acf8b' 
  AND token = 'mX8qcmYwTKMmxVnfjUJ3/lPDrHGZqDdP7JCEZLCMW/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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