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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9195e93b5563f3669f2fad7f178505fbd1d9189c74f988cd0bf6f6e427db73' 
  AND token = 'CWgGG5oN7K1r3zKnd203n2UkcMBd8VWa3UjG4DY8wUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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