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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02042a321b61503270f8dad9b4e961a4f1021f7e11ed9c8805e09d2f26feb7f6' 
  AND token = 'aK0dcrnAZAHd96Z1PGYHVTFI/6PG0CDRP4Pd2vlU17Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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