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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01224e42da6fb6c764eed0c0c44b7ded1fe6e86fc7d61c9cbbf31791b48ca3f' 
  AND token = 'bv/gja5SoaHjX8GYTJqR8gM9DXeKWYhNrrfiAaqGDbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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