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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c894e1c89843fbba78aaa8436448f53014c14f67d49f1a2e8e76435a1f3b1ab' 
  AND token = 'Ia7NBqYVC98waisD0i3YiRHx3ZYL6f75klMJ/Sd1dHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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