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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e9018128077299a8f77adaa04550e3e81cf3cb4d0faada6e9cf5e85366c708' 
  AND token = '2jo9Ya2yQ2OS6KKYBY9YPxspNrZN1siOscfUolPlStI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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