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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53d23f4a2a13671839f702e1c1a165757bd6176290d41866baadb82648ecd45' 
  AND token = 'px+5DcfEJQy3iB5GiE/Cib5H/0+C2JmJpwI6G2dK9Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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