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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9006ab52c1e8b1c2bebb40b861396bfd58eeaecfe2b425f332487d71f501b2ed' 
  AND token = 'pIZiv9jBtvx9viF96ovt2cKZSQYL4qwi7BdK8YZJI5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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