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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2387737daea102c5f17c17a6034a13bc4210ca6d4347da91291db0a820c2079e' 
  AND token = 'a0vX+w8Sc4uPhV5s3OSy4YkKqvn2MxhF7/URwZYKADs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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