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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c2a4a66b94125c33281c550dd7c38f050dc3249842284b07a849d2cf63f64f' 
  AND token = '2sqJBeFudCbR8MBFyE770TDZnXx9Djn1oqlsOG3rrYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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