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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14c4b752562ec6e5001156481476eb734dbd66c89feb9d928995fcc5de84214' 
  AND token = '89BZEWkEkReJ1lGqt7+Gvs6Z8SXa/KbQ9D4yhLEk5JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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