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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63070191fe5eb58787298db53f8b3ed96d1eb347bf303d927200ce28d7d10fb' 
  AND token = 'um+HKvf92K2eKhzuYrO6dhEyf7tIDHVzKnGS4yar+Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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