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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882b997f5a42a6570200ede8fe7c039e2c5a0a607d005d0cefd72c11be1043ee' 
  AND token = 'nahhK/K1l5y8syQcQYzKLrKCRmVdHBt4jv4yBnMeLB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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