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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3bb028bf96f9119fda6595139a9cd4710a72e9763629ce2d4fdb1d11efb235' 
  AND token = '5CZZgx91+5MQ3x0O4PwGlPIXWuk+KSsp0wgqU9ndwOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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