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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d4e673a9e7d09f076cb00ebde74f0d52500b8c03dc93f8cd4e0ebd666e37a2' 
  AND token = '4ggP4QdTQYmN3EZ9CmAEnJEQpPzosWNGthqy1rQR9xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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