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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ffbaa7c58b967ea7ff7e3ae41def04614c4e0047a5e8f481059bdc5d86c9c8' 
  AND token = 'L370Hmh8K04gI+nqREdLO4/Q5kjW8hJVFUp1rOtTKVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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