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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d23005b623d228ced0b1e0efe18cc590b9d38cf483670b48951ef09997f342' 
  AND token = 'wiZSZq5kOjUNt/oI7JO3TdtFvdltLXZ7Y5QRJ4bwJX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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