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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931f38e5af9d6632bcca8e84b2641d04ae97aa0855df7d397246700e0a747c5b' 
  AND token = 'PLlameBCBUvpdKixXuV4tHNL80M+lY/+uVHtoCLcRO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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