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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1caba117010259e0a11906c9ca954d34da6b112f9be95ec0dc46b299de801d52' 
  AND token = 'R/+4siXHjuvqC+5p8s6OdEjFZu2OuI11b8dPoHS+A40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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