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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7571a80257a5045b1d7b331a631ec570ee1b7ce0b35f6532fddd95ba717a41e4' 
  AND token = 'O7RGt9JWwZTWX0T41LwqZG7idmNq+kob+e/oc44xCFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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