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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ef2eac34631f8adf1b527838644763302ad761006d92ce6565eb2d482bcf35' 
  AND token = '95k0vElYS7DqJt2bxlil/0WfeR4jUE9Yrwipum4h+e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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