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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b5d15b26c60f8dc4c5ea374bc9ae203478f1b8195c46869b3e62804e6a9d74' 
  AND token = 'c647/TF8htFVE8VANw5T3VAd8K2rzYUAxqKcjYvyim4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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