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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202fa4449a7d6f86beb2d16bfcc1ee05c9f170df119b635ee430471c8611cec9' 
  AND token = 'a1OS9XP6p0WfUzuETiOWX/Kv2ZOdGL33d61oQp9vbQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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