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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612e82b7b610a25cdf6bfa687a5e780e5c2c51e3d7bcc13a653bb912cc52b676' 
  AND token = 'YRxq0mFAyplL/i9SUxsECTvmK/xaQlZYKdjaeDHBNxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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