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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ca75a9ed864c0a3db7c2c265702a5ec5d96ca8fed328f3970f1e1a20352fe9' 
  AND token = 'sMgi7/yk6MXQzdaItBr9iauRTwxM4lrIRXLAvjUa5QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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