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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dd45bd1f33f68b22c09538add5e309c0d051b843a34a4a078db2b45a67ec04' 
  AND token = 'WwExt6wnJpZkYFedfI0AnGwmt50D8vTJM48/U6H9urs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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