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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4beae48203a785c2e2a7cb5a5709a1283fe7c7fb3d830cdde2d5c44d0f002699' 
  AND token = 'hM2RzPHyjMOOj6unRmQ7M30yFJiJZ/S+Qhej08ZSW6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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