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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8e6a321b81344122386bd817c6e9faa0c86b5ca79649ebaa1ad3be1e8f2e1f' 
  AND token = 'PtRpVnG+VlML/QqNciYSUkbm7EQbgCkxlfpRdh05VXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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