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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27051ad1e61d3d34f42c1f09587dd7773cc7a45ba4d41062ca453cc6d009f6e7' 
  AND token = 'eqlI95oFJBz6lQ0JriDQ1+rp2Ok5SCINcrYGlzAaU6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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