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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a7f06aff86eb0b95e6120b0e038f76b5bb1e35ba94af3117b780479836c7de' 
  AND token = 'clpSkSM5vR1OBN1AZybMVxbvpu59TCYHYvZSrae8NVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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