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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954cbb1e5697d1bbab5ee6d607dbe52850b033bf5e215a06392e859b058481c2' 
  AND token = 'PxB7YmbzpfoQpYa3h9viK6mqKEkT8PvawnX9e9JGAIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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