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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d39bc3d307efdd7746f1971d12722f80a0e0db16b0c53673fc9ad6bbcd6428' 
  AND token = 'GXym7oUb6B7pO/YG6ecL7kCVa/ha807I6GBiV17qH7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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