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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3007b3f29dd0fabff45489095a3c0d70073dec40e0c4acf5202416efa1f9feb' 
  AND token = '7U9rapeA1fvyc64APltEotqb6zkGUAWKZIiiO4beuG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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