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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db61f3ad5b3c959acf630f1cbf4a09e277ef36caf953e682330ca1af9d92e898' 
  AND token = '6pnn4f7Ic6Ha8Rkxxzm+ng/JcNwkJI5pbHlW6Qp7+WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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