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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe84877487802f7a21ecf9e2e3d1ff7fdb8b5803d9038c82c8ea732a57be10f' 
  AND token = 'qaFlnG9r6D477nBQ1t1ONxXqQboF4oRh8bFFzvBpE3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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