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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d151c9facfc5246946b24db2de799ff6be0b59458e466e8df3b47e28524df18' 
  AND token = 'g39Plk3Ad6PdgkE7JbR09Uc+55GoWWuqgrsi+FH58zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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