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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988f1ae002bb0046844b513b8aad66fde9a2f09cc5969eafd3c48b3e1e78eb44' 
  AND token = 'bJkZWRewsLYc1tQ+xS/seO7L89r1QKssmq5qtG5CUT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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