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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47147987c0f06d5606c81d4623980f97a37df97f091fe93a44f866ee90987773' 
  AND token = 'uoWYgxl6Mc2spiI5LIkA4511UvhQdvWAQ0l3VswVzJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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