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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26c07a4be708bfaa00b65f2e1a3d75f1e8e62393dba90b893a87fbe4f5b907f' 
  AND token = 'XNLyh6/TOAVD6SoDp1L9O5rYjoysUyg8IYVhUFTBuNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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