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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38caffc16466e63ae2b5ef8a1d622933f0df3229dc9f6081c70cb708b203dbda' 
  AND token = '9QUJpF9SsPejfs1UEePcz0g7cMOa1dS13FJO05Rso0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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