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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4032d08ab0aad0d12ce683afab8d3c6f9541d8ab5b57bf33aa92726557e11d51' 
  AND token = '1yQFeKMXm2H8CtYcMVcodNKipv7CyBk1BE8gMkK70xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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