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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dfd1810e938b4d2f47f9566553fe39890cae27b96325c016363860a28fa85d' 
  AND token = 'ra98codlIfH1Gcz3D9imY9fHNVA2ui1dkRMt9rcPUA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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