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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e1e49efb64e361b9de9badfd7c20dca24603044f81e4a24c544cc6f89f396a' 
  AND token = 'alJq1nmFwx1Bex0V5oQJp1lEaM5Fbeln7BEn3R4uyic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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