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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886bf0adbefb69f6470a9c5b6fa6d6b2b53ba3855531b252f8c53d7feeff9a58' 
  AND token = 'Fn3XRX07BxoS25CKTQavzO28risoHWV/oXMu2lhFf+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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