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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba4bf5ae33ad7269452d9519a0ed3b0e6f2dc7ce72b29e3c805cb33092081e3' 
  AND token = 'Ukap4DN2h2d73txRw1QvM86FNY+aIHPhMqERYFrWS5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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