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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26533844e43cce9f6670cc7665602850386f4823b2b8d6d1ee62f6a52de7a5a' 
  AND token = 'IlqT7svCbBecv+zI1Lmabeu5P7TePcuX8w8M2tP8PgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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