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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd81db972a52b1771e700835a138519a9e3c6de3ffa8d58e1aa301553d99035' 
  AND token = 'd9znlADjGddY24F/i/i7aoV+BzuGXOgo2IJUFjraon8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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