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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f168b9b5f56cf79db5551584a73a087c2a18a33f8b04e95e6b2ccfe2375129' 
  AND token = '1dnZFdY+JkBeVQ407ycRtFCj+EvKN/ker5WdniNLmbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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