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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b07335e52707e8058ed5527bfbc14294acc992ea7134c43f95b233c528625ba' 
  AND token = 'fnvh1xBXB73zrTZCW+B/gaRWZf3Dt9omiRuNvtVxqO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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