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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8abd0784a9f01c20ff39e3a69e9dd7847de080d24a083445f845d6243e19464' 
  AND token = 'JU7MEXMWtR830VfFxhEENfRestGNe+exIDXqxVjgsBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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