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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c036e3a687388a997fd59f6beef68f2e3176d3ebd03b9dd757197fbd7d1d1ff7' 
  AND token = '8B+E/k4t+cqYMR2Um+ZSnz9XS3IQmWS76l/2uwuo3U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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