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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c876e539f54a668cb205c47254c89299a52283c89cfce77abb26b6834ab37cb6' 
  AND token = 'O+4xd5Mvnft1PT5jQx+KSH3PFwsGqiDfN9Agsx/1OmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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