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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db850efac405c2d47c4d3f7b3387eaa146f9f19092ae71e5deebcd08076c986' 
  AND token = 'fdI+HuWzSyY/D37/vUYQr4wOut9zp1OtjzGm659q9UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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